A pilot voxel-based morphometry study of older adults after the PICMOR intervention program

Area of Science:

• Neuroscience
• Cognitive Psychology
• Gerontology

Background:

• Age-related cognitive decline, particularly in executive functions, is linked to structural brain changes like reduced lateral prefrontal cortex volume.
• Cognitive interventions using social activities, such as conversations, show promise in preventing or delaying these age-related changes.
• Previous research indicates verbal fluency can be improved through conversation-based interventions in healthy older adults, but underlying neural mechanisms are not well understood.

Purpose of the Study:

• To identify candidate brain regions responsible for cognitive function enhancement through conversation-based interventions.
• To analyze structural magnetic resonance imaging (MRI) data from a previous intervention study to explore neural correlates of cognitive improvement.
• To investigate the impact of a structured conversation program (PICMOR) versus unstructured conversation on brain structure in older adults.

Main Methods:

• Voxel-based morphometric analysis of structural MRI data.
• Comparison of regional brain volume between an intervention group (PICMOR) and a control group (unstructured conversation).
• Exploration of brain regions where volume positively correlated with increased verbal fluency task scores.

Main Results:

• The intervention group exhibited greater volume in the superior frontal gyrus, parahippocampal gyrus/hippocampus, posterior middle temporal gyrus, and postcentral gyrus compared to the control group.
• No brain regions showed greater volume in the control group than in the intervention group.
• The inferior parietal lobule was identified as a region where volume positively correlated with improvements in verbal fluency task scores.

Conclusions:

• The study successfully identified candidate brain regions associated with the beneficial effects of conversation-based interventions on cognitive function.
• Findings suggest that interventions like PICMOR may positively impact brain structure, including areas like the lateral prefrontal cortex, crucial for executive functions.
• While preliminary, the results provide a foundation for understanding the neural basis of cognitive enhancement through social interaction in aging.